template<class T = void> struct equal_to {
constexpr bool operator()(const T& x, const T& y) const;
};
constexpr bool operator()(const T& x, const T& y) const;
template<> struct equal_to<void> {
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
-> decltype(std::forward<T>(t) == std::forward<U>(u));
using is_transparent = unspecified;
};
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
-> decltype(std::forward<T>(t) == std::forward<U>(u));
template<class T = void> struct not_equal_to {
constexpr bool operator()(const T& x, const T& y) const;
};
constexpr bool operator()(const T& x, const T& y) const;
template<> struct not_equal_to<void> {
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
-> decltype(std::forward<T>(t) != std::forward<U>(u));
using is_transparent = unspecified;
};
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
-> decltype(std::forward<T>(t) != std::forward<U>(u));
template<class T = void> struct greater {
constexpr bool operator()(const T& x, const T& y) const;
};
constexpr bool operator()(const T& x, const T& y) const;
template<> struct greater<void> {
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
-> decltype(std::forward<T>(t) > std::forward<U>(u));
using is_transparent = unspecified;
};
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
-> decltype(std::forward<T>(t) > std::forward<U>(u));
template<class T = void> struct less {
constexpr bool operator()(const T& x, const T& y) const;
};
constexpr bool operator()(const T& x, const T& y) const;
template<> struct less<void> {
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
-> decltype(std::forward<T>(t) < std::forward<U>(u));
using is_transparent = unspecified;
};
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
-> decltype(std::forward<T>(t) < std::forward<U>(u));
template<class T = void> struct greater_equal {
constexpr bool operator()(const T& x, const T& y) const;
};
constexpr bool operator()(const T& x, const T& y) const;
template<> struct greater_equal<void> {
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
-> decltype(std::forward<T>(t) >= std::forward<U>(u));
using is_transparent = unspecified;
};
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
-> decltype(std::forward<T>(t) >= std::forward<U>(u));
template<class T = void> struct less_equal {
constexpr bool operator()(const T& x, const T& y) const;
};
constexpr bool operator()(const T& x, const T& y) const;
template<> struct less_equal<void> {
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
-> decltype(std::forward<T>(t) <= std::forward<U>(u));
using is_transparent = unspecified;
};
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
-> decltype(std::forward<T>(t) <= std::forward<U>(u));
template<class T, class U>
constexpr auto operator()(T&& t, U&& u) const;